<![CDATA[1A Collections]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/browse?tags=symmetry&page=2&output=rss2 Tue, 09 Apr 2024 21:16:44 +0100 p1acollections@esc.cam.ac.uk (1A Collections) Zend_Feed http://blogs.law.harvard.edu/tech/rss <![CDATA[TF0753 Leptaena]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/111

Title

TF0753

Leptaena

Description

Stratigraphic Range

Ordovician to Carboniferous

Taxonomy

Phylum: Brachiopoda
Class: Strophomenata
Order: Strophomenida
Family: Rafinesquinidae
Genus: Leptaena

Distinctive Features

Bilateral symmetry
Ribs
Growth lines

Preservation

Mineral replacement of shell
TF0753_HS.png
TF0753_sketch.png
]]> Thu, 20 Jun 2019 12:36:51 +0100 <![CDATA[TF0708 Terebratula maximes]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/110

Title

TF0708

Terebratula maximes

Description

Species

Terebratula maximes

Stratigraphic Range

Pliocene to Pleistocene

Taxonomy

Phylum: Brachiopoda
Class: Rhynchonellata
Order: Terebratulida
Genus: Terebratula

Distinctive Features

Bilateral symmetry
Two articulated valves
Growth lines
Pedicle

Preservation

Infil of valves with bioclastic matrix
Original shell material (partially broken)
TF0708_HS.png
TF0708_sketch.png
]]> Thu, 20 Jun 2019 12:35:23 +0100 <![CDATA[TF0707 Terebratula biplicata]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/109

Title

TF0707

Terebratula biplicata

Description

Species

Terebratula biplicata

Stratigraphic Range

Cretaceous

Taxonomy

Phylum: Brachiopoda
Class: Rhynchonellata
Order: Terebratulida
Genus: Terebratula

Distinctive Features

Bilateral symmetry
Two articulated valves
Commissure
Pedicle
Growth lines

Preservation

Mineral replacement of shell
TF0707_HS.png
TF0707_sketch.png
]]> Thu, 20 Jun 2019 12:33:51 +0100 <![CDATA[TF0706 Ornithella]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/108

Title

TF0706

Ornithella

Description

Stratigraphic Range

Jurassic

Taxonomy

Phylum: Brachiopoda
Class: Rhynchonellata
Order: Terebratulida

Distinctive Features

Bilateral symmetry
Two articulated valves
Commissure
Growth lines
Pedicle

Preservation

Mineral replacement of shell
TF0706_HS.png
TF0706_sketch.png
]]> Thu, 20 Jun 2019 12:31:55 +0100 <![CDATA[TF0705 Spirifer verneuli]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/107

Title

TF0705

Spirifer verneuli

Subject

Specimen Age

Devonian

Description

Species

Spirifer verneuli

Stratigraphic Range

Ordovician to Permian

Taxonomy

Phylum: Brachiopoda
Class: Rhynchonellata
Order: Spiriferida

Distinctive Features

Bilateral symmetry
Two articulated valves
Commissure
Ribs
Pedicle

Preservation

Internal mould
TF0705_HS.png
TF0705_sketch.png
]]> Thu, 20 Jun 2019 12:29:49 +0100 <![CDATA[TF0704 Chonetes]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/106

Title

TF0704

Chonetes

Subject

Specimen Age

Silurian

Description

Stratigraphic Range

Ordovician to Permian

Taxonomy

Phylum: Brachiopoda
Class: Strophomenata
Order: Strophomenida

Distinctive Features

Bilateral symmetry
Ribs

Preservation

External moulds and internal moulds
TF0704_HS.png
TF0704_sketch.png
]]> Thu, 20 Jun 2019 12:24:17 +0100 <![CDATA[TF0703 Atrypa]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/105

Title

TF0703

Atrypa

Subject

Specimen Age

Silurian

Description

Stratigraphic Range

Silurian to Devonian

Taxonomy

Phylum: Brachiopoda
Class: Rhynchonellata
Order: Spiriferida
Genus: Atrypa

Distinctive Features

Bilateral symmetry
Two valves
Commissure
Radial ribs
Growth lines

Preservation

Mineral replacement of shell
TF0703_HS.png
TF0703_sketch.png
]]> Thu, 20 Jun 2019 12:21:45 +0100 <![CDATA[TF0701 Lingulella]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/103

Title

TF0701

Lingulella

Subject

Age

Cambrian

Description

Stratigraphic Range

Cambrian to Ordovician

Taxonomy

Phylum: Brachiopoda
Class: Lingulata
Order: Lingulida
Genus: Lingulella

Distinctive Features

Bilateral symmetry
Growth lines

Preservation

Organic film

Advanced notes

Lingulella had a phosphate shell in life, which is rare for a brachiopod. Most brachiopods had shells made from calcium carbonate.
Lingulella is very similar to the modern genus Lingula.
TF0701_HS.png
TF0701_sketch.png
]]> Thu, 20 Jun 2019 12:15:02 +0100 <![CDATA[Brachiopod]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/102

Title

Brachiopod

Description

Taxonomy

Phylum: Brachiopoda

Diagnostic features

Two valves (brachial and pedicle)

Bilateral symmetry

Growth lines

Adductor and ductor muscle scars

Pedicle

Commissure

Gape

Teeth and socket (articulates; no teeth or socket in inarticulates)

Stratigraphic range

Cambrian to present

Way of life

Marine

Attach to hard substrates using pedicle

Filter feeding

Sessile

Infaunal, epifaunal, reclining

Advanced notes

Apparent decrease in diversity over time

Limited to marginal environments in the modern ocean

Adductor muscle used to close shell, ductor muscle used to open shell

Specimens

Browse brachiopods

External links

Yale Peabody Museum of Natural History: differences between bivalves and brachiopods

Cortland Paleo, Brachiopoda: brachiopod morphology and ecology information

Learn about types of preservation

brachiopod_sketch.png
brachiopod_sketch_profile.png
]]> Thu, 20 Jun 2019 12:12:49 +0100 <![CDATA[TF0114 Unio littoralis]]> https://wserv3.esc.cam.ac.uk/p1acollections/items/show/99

Title

TF0114

Unio littoralis

Subject

Location

River gravels, Burwell, Cambridgeshire

Description

Species

Unio littoralis

Taxonomy

Phylum: Mollusca
Class: Bivalvia
Order: Unionata
Family: Unionidae

Distinctive Features

Umbo
Two valves showing dorso-ventral symmetry
Growth lines
Adductor muscle scar
Palial line
Dentition

Preservation

Original shell

Advanced notes

Mobile, infaunal suspension feeder
TF0114_HS.png
TF0114_sketch.png
]]> Thu, 20 Jun 2019 11:57:03 +0100